<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
    <div id="app">
        设置模板
        <span>{{count}}</span>
    </div>
    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el:'#app',
            data(){
                return {
                    count:2
                }
            },

        })
        // 对数据进行挂载，延迟执行
        setTimeout(()=>{
            vm.$mount('#app');
        },2000)

    </script>
</body>
</html>